feral

adj. wild, untamed; brutal

A feral organism is one that has escaped from domestication and returned, partly or wholly, to its wild state. Rarely will a local environment perfectly integrate the feral organism into its established ecology. Therefore, feral animals and plants can cause disruption or extinction to some indigenous species, affecting  wilderness and other fragile ecosystems.
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A furry convention (also furry con or fur con) is a formal gathering of members of the furry fandom — people who are interested in the concept of fictional non-human characters with human characteristics. These conventions provide a place for fans to meet, exchange ideas, transact business and engage in entertainment and recreation centered around this concept. Originating in California, USA during the mid-1980s, there are now over 25 annual furry conventions worldwide, mostly in North America and Europe.
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Feral untamed; often used in the sense of having escaped from domesticity and run wild. [more]Feral - Community and Resources

Adjective
1. wild and menacing; "a ferocious dog"
(synonym) ferine, savage
(similar) wild, untamed

adj. dismal, lugubrious, funereal, gloomy